“And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.”
King James Version (KJV)
4:30 Grieve not the Holy Spirit - By any disobedience. Particularly by corrupt discourse; or by any of the following sins. Do not force him to withdraw from you, as a friend does whom you grieve by unkind behaviour. The day of redemption - That is, the day of judgment, in which our redemption will be completed.
Eph 4:30 Grieve not the Holy Spirit of God. Such sins as those described above grieve the Holy Spirit, nor will he continue to dwell those addicted to them. Whereby ye are sealed unto the day of redemption. The sealing of the Holy Spirit is an earnest, a proof, an assurance of the final redemption. See Eph 1:13. If we grieve him away, the seal will be gone.